#include "idt.h"

#include "core_interrupt.h"

namespace IDT {

// Interrupt Descriptor Table, 8 Byte aligned
constinit struct InterruptDescriptor idt[256] = {};

// Struct used for loading (the address of) the Interrupt Descriptor Table into
// the IDT-Register
struct Register {
	uint16_t limit =
		sizeof(idt) - 1;  // Address of the last valid byte (relative to base)
	struct InterruptDescriptor* base = idt;
} __attribute__((packed));

static_assert(sizeof(InterruptDescriptor) == 16,
			  "IDT::InterruptDescriptor has wrong size");
static_assert(sizeof(Register) == 10, "IDT::Register has wrong size");
static_assert(alignof(decltype(idt)) % 8 == 0, "IDT must be 8 byte aligned!");

void load() {
	// Create structure required for writing to idtr and load via lidt
	Register idtr;
	asm volatile("lidt %0\n\t" ::"m"(idtr));
}

void set(Core::Interrupt::Vector vector, InterruptDescriptor descriptor) {
	idt[static_cast<uint8_t>(vector)] = descriptor;
}
}  // namespace IDT